var walk = function(dir, done) {
    var results = []
    fs.readdir(dir, function(err, list) {
        var artist = [];
        list.forEach(function(item, callback) {
            artist.push({artist: item});

        if(err) return done(err);
        var i = 0;
        (function next() {
            var tmp = [];
            var file = list[i++]
            if(!file) return done(null, results);
            fulldir = dir + '/' + file;

            fs.stat(fulldir, function(err, stat) {
                if(stat && stat.isDirectory()) {

                    walk(fulldir, function(err, res) {
                        artist.push({album: file});
                        //artist[file] = res;
                        //results.push(artist);
                        //tmp.push(file);
                        //tmp.push(res)
                        // results.push({artist: file});
                        // results.push(res);
                        next();
                    });

                }
                else {
                    if(path.extname(file) =='.mp3')
                        //tmp.push(file);
                    next();
                }
            });

        })();
            });

        results.push(artist);
    });
};